非稳定流抽水试验在傍河深基坑降水工程中的实践应用  

Dewatering design and practice of deep foundation pit close to river based on unsteady flow pumping test

作　　者：廖俊展[1] LIAO Junzhan(BGI Engineering Consultants Ltd.,Beijing 100038,China)

机构地区：[1]北京市勘察设计研究院有限公司,北京100038

出　　处：《四川建筑科学研究》2021年第6期66-70,共5页Sichuan Building Science

摘　　要：含水层水文地质参数的合理性是深基坑地下水控制设计的关键因素,近河深基坑水文地质参数的确定更加复杂和困难,若按照经验或者规范取值进行设计往往会造成计算结果与工程实际有较大出入,影响安全及工期。本文以北京通州某明挖隧道深基坑降水工程为例,根据现场专项水文地质试验确定的水文地质参数建立了三维水文地质模型,模拟了基坑降水过程中地下水位的变化情况,并和现场试验数据做了对比;同时也和相关的手册、规范所采用的水文地质参数做了对比。结果表明:在确定近河含水层水文地质参数进行基坑的降水设计计算时,应考虑岩性相同的含水层其渗透系数的差异。该模型对该工程地质条件、水文地质条件下的基坑降水也具有指导意义。Determination of hydrogeology parameters of deep foundation pit is the critical factor for foundation dewatering design.The obtaining of parameters is more difficult with the addition of deep foundation pit close to river.Based on the dewatering project of a deep foundation pit for Open-Cut Tunnels in Beijing,pumping tests were applied to obtain the hydrogeology parameters.Using a three dimensional finite-difference numerical simulation software,the finite difference method was used to calculate the groundwater level in the process of dewatering.The comparison results between numerical model and in-situ test show that model in this paper can be used to simulate the dewatering of deep foundation pit in the site of Tongzhou.

关 键 词：傍河深基坑 非稳定流抽水试验 水文地质参数 降水 数值模拟 

分 类 号：TU43[建筑科学—岩土工程]